Bypass assert_speedup on CI
Bypass assert_speedup on CI

It just seems to unreliable, probably because it's running on a VM so
doesn't have dedicated CPU.

y-yagi/spring,maclover7/spring,mariusbutuc/spring,grosser/spring,ypresto/spring,pigoz/spring,universsky/spring-1,smathy/spring,rails/spring,slobodankovacevic/spring